Measxtriitg instrument



Dec. 29,1931. F. DE GUERRE 1,339,014

MEASURING INSTRUMENT Filed June '11, 1930.

Patented Dec. 29, 1931 UNITED STATES.

ATaiar orrice FRANK. DE GUERRE, OF VILLA GRANDE; CALIFORNIA MEASURING INsTiaUMENr Application filed. June 11, 1930. Serial No. 460,506.

This invention relates to improvements in measuring instruments and has particular reference to an improved protractor having large practical readily visible readings which protractor may be instantly attached or detached to an ordinary folding rule.

A further object of the invention is to provide an adjustable spring guide clip for effecting the attaching of the protractor to the rule thereby producing an eflicient practical, economically manufactured and portable tool that may be optionally usedas a protractor, bevel, squareor triangle.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

, Figure 1 is a top plan view of a rule having my invention applied thereto,

Figure 2 is an enlarged fragmentary view of a portion of the rule,

Figure 3 is a cross sectional view taken on the line 3-3 of Figure 2,

Figure 4: is an enlarged fragmentary view taken on the line 44 of Figure 1,

Figure 5 is a cross sectional View taken on the line 5-5 of Figure 1, and

Figure 6 is a perspective view of the rule attaching clamp.

Protractors are usually instruments in themselves and of small size with the result that readings thereon are difiicult to view, particularly if the light is bad. I am also aware of the fact thatprotractors of large dimensions have been previously produced,-

but these to my knowledge are permanently attached to the common folding rule. As a result of said permanent construction the efliciency of the rule as a measuring tool, is adversely affected and said construction presents a cumbersome, impractical, unportable instrument. I have, therefore in the present device endeavored to overcome these disadvantages and inconveniences and by virtue of the present construction employed, have provided a large readable readily visible protractor with large accurate readings which protractor may be readily detached or attached to the rule, at will.

In the accompanying drawings wherein for the purpose of illustration is shown a preferred embodiment of my-invention, the

numerals 5, 6, 7 and 8 refer to the sections of an ordinary folding rule. The sections 5 and 6 are hinged as at 9 and the sections 7 and 8 are hinged as at 11. The sections 6 and 7 are hinged as at 12. The construction thus far described is an ordinary rule and forms no part of my invention.

In the section 7 I position a plurality of fastening sockets 13 which may be of any desired number. A socket is positioned as at 14 in the section 6 of the rule. The protractor is shown at 16 and is of large size,having large accurate readings. These protractor plates may be made in different are lengths, as for instance, the octant of 45 degrees for 7 pocket and field use, the quadrant of 90 degre es for shop use, and for extensive ofiice use the semi-circle of 180 degrees. These various types may be readily utilized with an q, ordinary rule by virtue of my improved adjustable detachable clip. The protractor is provided with a button-like projection which engages the sockets 14: and is adapted to be passed over the section 7 where it is held in engagement therewith by a clip 17 having a fastening head 18 adapted to engage one of the sockets 13. Side pieces 19 serve to hold the clip 17 in parallel relation to the rule and permit the clip to readily slide over the sections 7 when it is desired to retain the protractor in a fixed position on the rule.

It will be noted that the adjustable clip is preferably made of spring metal and is curved slightly upward in the center so that when pressure is placed on the fastening head 18, it will oblate this curve and produce a resilient hold-fast which reduces danger of displacement to a minimum.

From the foregoing description considered M in connection with the accompanying drawings, it will be obvious that I have devised a unique instrument that will readily accomplish all the objects above set forth.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, size, shape and arrangement of parts may be resorted to Without departing 5 from the spirit of the invention or the scope of the subjoined claim.

Having thus described my invention, I e1aim:-

An adjustable spring clip fastener for a measuring rule adapted to connect a protractor to said rule, said clip havinga projection thereon receivable in sockets formed in the rule and being equipped 'with side pieces for guiding the clip over said rule. In testimony whereof I affix my signature.

FRANK DEGUERRE. 

